drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c

   1 /*
   2  * Copyright 2009 Jerome Glisse.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 /*
  27  * Authors:
  28  *    Jerome Glisse <[email protected]>
  29  *    Dave Airlie
  30  */
  31 #include <linux/seq_file.h>
  32 #include <linux/atomic.h>
  33 #include <linux/wait.h>
  34 #include <linux/kref.h>
  35 #include <linux/slab.h>
  36 #include <linux/firmware.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <drm/drm_drv.h>
  40 #include "amdgpu.h"
  41 #include "amdgpu_trace.h"
  42 #include "amdgpu_reset.h"
  43
  44 /*
  45  * Fences mark an event in the GPUs pipeline and are used
  46  * for GPU/CPU synchronization.  When the fence is written,
  47  * it is expected that all buffers associated with that fence
  48  * are no longer in use by the associated ring on the GPU and
  49  * that the relevant GPU caches have been flushed.
  50  */
  51
  52 struct amdgpu_fence {
  53         struct dma_fence base;
  54
  55         /* RB, DMA, etc. */
  56         struct amdgpu_ring              *ring;
  57         ktime_t                         start_timestamp;
  58 };
  59
  60 static struct kmem_cache *amdgpu_fence_slab;
  61
  62 int amdgpu_fence_slab_init(void)
  63 {
  64         amdgpu_fence_slab = kmem_cache_create(
  65                 "amdgpu_fence", sizeof(struct amdgpu_fence), 0,
  66                 SLAB_HWCACHE_ALIGN, NULL);
  67         if (!amdgpu_fence_slab)
  68                 return -ENOMEM;
  69         return 0;
  70 }
  71
  72 void amdgpu_fence_slab_fini(void)
  73 {
  74         rcu_barrier();
  75         kmem_cache_destroy(amdgpu_fence_slab);
  76 }
  77 /*
  78  * Cast helper
  79  */
  80 static const struct dma_fence_ops amdgpu_fence_ops;
  81 static const struct dma_fence_ops amdgpu_job_fence_ops;
  82 static inline struct amdgpu_fence *to_amdgpu_fence(struct dma_fence *f)
  83 {
  84         struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base);
  85
  86         if (__f->base.ops == &amdgpu_fence_ops ||
  87             __f->base.ops == &amdgpu_job_fence_ops)
  88                 return __f;
  89
  90         return NULL;
  91 }
  92
  93 /**
  94  * amdgpu_fence_write - write a fence value
  95  *
  96  * @ring: ring the fence is associated with
  97  * @seq: sequence number to write
  98  *
  99  * Writes a fence value to memory (all asics).
 100  */
 101 static void amdgpu_fence_write(struct amdgpu_ring *ring, u32 seq)
 102 {
 103         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 104
 105         if (drv->cpu_addr)
 106                 *drv->cpu_addr = cpu_to_le32(seq);
 107 }
 108
 109 /**
 110  * amdgpu_fence_read - read a fence value
 111  *
 112  * @ring: ring the fence is associated with
 113  *
 114  * Reads a fence value from memory (all asics).
 115  * Returns the value of the fence read from memory.
 116  */
 117 static u32 amdgpu_fence_read(struct amdgpu_ring *ring)
 118 {
 119         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 120         u32 seq = 0;
 121
 122         if (drv->cpu_addr)
 123                 seq = le32_to_cpu(*drv->cpu_addr);
 124         else
 125                 seq = atomic_read(&drv->last_seq);
 126
 127         return seq;
 128 }
 129
 130 /**
 131  * amdgpu_fence_emit - emit a fence on the requested ring
 132  *
 133  * @ring: ring the fence is associated with
 134  * @f: resulting fence object
 135  * @job: job the fence is embedded in
 136  * @flags: flags to pass into the subordinate .emit_fence() call
 137  *
 138  * Emits a fence command on the requested ring (all asics).
 139  * Returns 0 on success, -ENOMEM on failure.
 140  */
 141 int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, struct amdgpu_job *job,
 142                       unsigned int flags)
 143 {
 144         struct amdgpu_device *adev = ring->adev;
 145         struct dma_fence *fence;
 146         struct amdgpu_fence *am_fence;
 147         struct dma_fence __rcu **ptr;
 148         uint32_t seq;
 149         int r;
 150
 151         if (job == NULL) {
 152                 /* create a sperate hw fence */
 153                 am_fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_ATOMIC);
 154                 if (am_fence == NULL)
 155                         return -ENOMEM;
 156                 fence = &am_fence->base;
 157                 am_fence->ring = ring;
 158         } else {
 159                 /* take use of job-embedded fence */
 160                 fence = &job->hw_fence;
 161         }
 162
 163         seq = ++ring->fence_drv.sync_seq;
 164         if (job && job->job_run_counter) {
 165                 /* reinit seq for resubmitted jobs */
 166                 fence->seqno = seq;
 167                 /* TO be inline with external fence creation and other drivers */
 168                 dma_fence_get(fence);
 169         } else {
 170                 if (job) {
 171                         dma_fence_init(fence, &amdgpu_job_fence_ops,
 172                                        &ring->fence_drv.lock,
 173                                        adev->fence_context + ring->idx, seq);
 174                         /* Against remove in amdgpu_job_{free, free_cb} */
 175                         dma_fence_get(fence);
 176                 } else {
 177                         dma_fence_init(fence, &amdgpu_fence_ops,
 178                                        &ring->fence_drv.lock,
 179                                        adev->fence_context + ring->idx, seq);
 180                 }
 181         }
 182
 183         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 184                                seq, flags | AMDGPU_FENCE_FLAG_INT);
 185         pm_runtime_get_noresume(adev_to_drm(adev)->dev);
 186         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 187         if (unlikely(rcu_dereference_protected(*ptr, 1))) {
 188                 struct dma_fence *old;
 189
 190                 rcu_read_lock();
 191                 old = dma_fence_get_rcu_safe(ptr);
 192                 rcu_read_unlock();
 193
 194                 if (old) {
 195                         r = dma_fence_wait(old, false);
 196                         dma_fence_put(old);
 197                         if (r)
 198                                 return r;
 199                 }
 200         }
 201
 202         to_amdgpu_fence(fence)->start_timestamp = ktime_get();
 203
 204         /* This function can't be called concurrently anyway, otherwise
 205          * emitting the fence would mess up the hardware ring buffer.
 206          */
 207         rcu_assign_pointer(*ptr, dma_fence_get(fence));
 208
 209         *f = fence;
 210
 211         return 0;
 212 }
 213
 214 /**
 215  * amdgpu_fence_emit_polling - emit a fence on the requeste ring
 216  *
 217  * @ring: ring the fence is associated with
 218  * @s: resulting sequence number
 219  * @timeout: the timeout for waiting in usecs
 220  *
 221  * Emits a fence command on the requested ring (all asics).
 222  * Used For polling fence.
 223  * Returns 0 on success, -ENOMEM on failure.
 224  */
 225 int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s,
 226                               uint32_t timeout)
 227 {
 228         uint32_t seq;
 229         signed long r;
 230
 231         if (!s)
 232                 return -EINVAL;
 233
 234         seq = ++ring->fence_drv.sync_seq;
 235         r = amdgpu_fence_wait_polling(ring,
 236                                       seq - ring->fence_drv.num_fences_mask,
 237                                       timeout);
 238         if (r < 1)
 239                 return -ETIMEDOUT;
 240
 241         amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
 242                                seq, 0);
 243
 244         *s = seq;
 245
 246         return 0;
 247 }
 248
 249 /**
 250  * amdgpu_fence_schedule_fallback - schedule fallback check
 251  *
 252  * @ring: pointer to struct amdgpu_ring
 253  *
 254  * Start a timer as fallback to our interrupts.
 255  */
 256 static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring)
 257 {
 258         mod_timer(&ring->fence_drv.fallback_timer,
 259                   jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT);
 260 }
 261
 262 /**
 263  * amdgpu_fence_process - check for fence activity
 264  *
 265  * @ring: pointer to struct amdgpu_ring
 266  *
 267  * Checks the current fence value and calculates the last
 268  * signalled fence value. Wakes the fence queue if the
 269  * sequence number has increased.
 270  *
 271  * Returns true if fence was processed
 272  */
 273 bool amdgpu_fence_process(struct amdgpu_ring *ring)
 274 {
 275         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 276         struct amdgpu_device *adev = ring->adev;
 277         uint32_t seq, last_seq;
 278
 279         do {
 280                 last_seq = atomic_read(&ring->fence_drv.last_seq);
 281                 seq = amdgpu_fence_read(ring);
 282
 283         } while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
 284
 285         if (del_timer(&ring->fence_drv.fallback_timer) &&
 286             seq != ring->fence_drv.sync_seq)
 287                 amdgpu_fence_schedule_fallback(ring);
 288
 289         if (unlikely(seq == last_seq))
 290                 return false;
 291
 292         last_seq &= drv->num_fences_mask;
 293         seq &= drv->num_fences_mask;
 294
 295         do {
 296                 struct dma_fence *fence, **ptr;
 297
 298                 ++last_seq;
 299                 last_seq &= drv->num_fences_mask;
 300                 ptr = &drv->fences[last_seq];
 301
 302                 /* There is always exactly one thread signaling this fence slot */
 303                 fence = rcu_dereference_protected(*ptr, 1);
 304                 RCU_INIT_POINTER(*ptr, NULL);
 305
 306                 if (!fence)
 307                         continue;
 308
 309                 dma_fence_signal(fence);
 310                 dma_fence_put(fence);
 311                 pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
 312                 pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
 313         } while (last_seq != seq);
 314
 315         return true;
 316 }
 317
 318 /**
 319  * amdgpu_fence_fallback - fallback for hardware interrupts
 320  *
 321  * @t: timer context used to obtain the pointer to ring structure
 322  *
 323  * Checks for fence activity.
 324  */
 325 static void amdgpu_fence_fallback(struct timer_list *t)
 326 {
 327         struct amdgpu_ring *ring = from_timer(ring, t,
 328                                               fence_drv.fallback_timer);
 329
 330         if (amdgpu_fence_process(ring))
 331                 DRM_WARN("Fence fallback timer expired on ring %s\n", ring->name);
 332 }
 333
 334 /**
 335  * amdgpu_fence_wait_empty - wait for all fences to signal
 336  *
 337  * @ring: ring index the fence is associated with
 338  *
 339  * Wait for all fences on the requested ring to signal (all asics).
 340  * Returns 0 if the fences have passed, error for all other cases.
 341  */
 342 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
 343 {
 344         uint64_t seq = READ_ONCE(ring->fence_drv.sync_seq);
 345         struct dma_fence *fence, **ptr;
 346         int r;
 347
 348         if (!seq)
 349                 return 0;
 350
 351         ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
 352         rcu_read_lock();
 353         fence = rcu_dereference(*ptr);
 354         if (!fence || !dma_fence_get_rcu(fence)) {
 355                 rcu_read_unlock();
 356                 return 0;
 357         }
 358         rcu_read_unlock();
 359
 360         r = dma_fence_wait(fence, false);
 361         dma_fence_put(fence);
 362         return r;
 363 }
 364
 365 /**
 366  * amdgpu_fence_wait_polling - busy wait for givn sequence number
 367  *
 368  * @ring: ring index the fence is associated with
 369  * @wait_seq: sequence number to wait
 370  * @timeout: the timeout for waiting in usecs
 371  *
 372  * Wait for all fences on the requested ring to signal (all asics).
 373  * Returns left time if no timeout, 0 or minus if timeout.
 374  */
 375 signed long amdgpu_fence_wait_polling(struct amdgpu_ring *ring,
 376                                       uint32_t wait_seq,
 377                                       signed long timeout)
 378 {
 379
 380         while ((int32_t)(wait_seq - amdgpu_fence_read(ring)) > 0 && timeout > 0) {
 381                 udelay(2);
 382                 timeout -= 2;
 383         }
 384         return timeout > 0 ? timeout : 0;
 385 }
 386 /**
 387  * amdgpu_fence_count_emitted - get the count of emitted fences
 388  *
 389  * @ring: ring the fence is associated with
 390  *
 391  * Get the number of fences emitted on the requested ring (all asics).
 392  * Returns the number of emitted fences on the ring.  Used by the
 393  * dynpm code to ring track activity.
 394  */
 395 unsigned int amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 396 {
 397         uint64_t emitted;
 398
 399         /* We are not protected by ring lock when reading the last sequence
 400          * but it's ok to report slightly wrong fence count here.
 401          */
 402         emitted = 0x100000000ull;
 403         emitted -= atomic_read(&ring->fence_drv.last_seq);
 404         emitted += READ_ONCE(ring->fence_drv.sync_seq);
 405         return lower_32_bits(emitted);
 406 }
 407
 408 /**
 409  * amdgpu_fence_last_unsignaled_time_us - the time fence emitted until now
 410  * @ring: ring the fence is associated with
 411  *
 412  * Find the earliest fence unsignaled until now, calculate the time delta
 413  * between the time fence emitted and now.
 414  */
 415 u64 amdgpu_fence_last_unsignaled_time_us(struct amdgpu_ring *ring)
 416 {
 417         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 418         struct dma_fence *fence;
 419         uint32_t last_seq, sync_seq;
 420
 421         last_seq = atomic_read(&ring->fence_drv.last_seq);
 422         sync_seq = READ_ONCE(ring->fence_drv.sync_seq);
 423         if (last_seq == sync_seq)
 424                 return 0;
 425
 426         ++last_seq;
 427         last_seq &= drv->num_fences_mask;
 428         fence = drv->fences[last_seq];
 429         if (!fence)
 430                 return 0;
 431
 432         return ktime_us_delta(ktime_get(),
 433                 to_amdgpu_fence(fence)->start_timestamp);
 434 }
 435
 436 /**
 437  * amdgpu_fence_update_start_timestamp - update the timestamp of the fence
 438  * @ring: ring the fence is associated with
 439  * @seq: the fence seq number to update.
 440  * @timestamp: the start timestamp to update.
 441  *
 442  * The function called at the time the fence and related ib is about to
 443  * resubmit to gpu in MCBP scenario. Thus we do not consider race condition
 444  * with amdgpu_fence_process to modify the same fence.
 445  */
 446 void amdgpu_fence_update_start_timestamp(struct amdgpu_ring *ring, uint32_t seq, ktime_t timestamp)
 447 {
 448         struct amdgpu_fence_driver *drv = &ring->fence_drv;
 449         struct dma_fence *fence;
 450
 451         seq &= drv->num_fences_mask;
 452         fence = drv->fences[seq];
 453         if (!fence)
 454                 return;
 455
 456         to_amdgpu_fence(fence)->start_timestamp = timestamp;
 457 }
 458
 459 /**
 460  * amdgpu_fence_driver_start_ring - make the fence driver
 461  * ready for use on the requested ring.
 462  *
 463  * @ring: ring to start the fence driver on
 464  * @irq_src: interrupt source to use for this ring
 465  * @irq_type: interrupt type to use for this ring
 466  *
 467  * Make the fence driver ready for processing (all asics).
 468  * Not all asics have all rings, so each asic will only
 469  * start the fence driver on the rings it has.
 470  * Returns 0 for success, errors for failure.
 471  */
 472 int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 473                                    struct amdgpu_irq_src *irq_src,
 474                                    unsigned int irq_type)
 475 {
 476         struct amdgpu_device *adev = ring->adev;
 477         uint64_t index;
 478
 479         if (ring->funcs->type != AMDGPU_RING_TYPE_UVD) {
 480                 ring->fence_drv.cpu_addr = ring->fence_cpu_addr;
 481                 ring->fence_drv.gpu_addr = ring->fence_gpu_addr;
 482         } else {
 483                 /* put fence directly behind firmware */
 484                 index = ALIGN(adev->uvd.fw->size, 8);
 485                 ring->fence_drv.cpu_addr = adev->uvd.inst[ring->me].cpu_addr + index;
 486                 ring->fence_drv.gpu_addr = adev->uvd.inst[ring->me].gpu_addr + index;
 487         }
 488         amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq));
 489
 490         ring->fence_drv.irq_src = irq_src;
 491         ring->fence_drv.irq_type = irq_type;
 492         ring->fence_drv.initialized = true;
 493
 494         DRM_DEV_DEBUG(adev->dev, "fence driver on ring %s use gpu addr 0x%016llx\n",
 495                       ring->name, ring->fence_drv.gpu_addr);
 496         return 0;
 497 }
 498
 499 /**
 500  * amdgpu_fence_driver_init_ring - init the fence driver
 501  * for the requested ring.
 502  *
 503  * @ring: ring to init the fence driver on
 504  *
 505  * Init the fence driver for the requested ring (all asics).
 506  * Helper function for amdgpu_fence_driver_init().
 507  */
 508 int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
 509 {
 510         struct amdgpu_device *adev = ring->adev;
 511
 512         if (!adev)
 513                 return -EINVAL;
 514
 515         if (!is_power_of_2(ring->num_hw_submission))
 516                 return -EINVAL;
 517
 518         ring->fence_drv.cpu_addr = NULL;
 519         ring->fence_drv.gpu_addr = 0;
 520         ring->fence_drv.sync_seq = 0;
 521         atomic_set(&ring->fence_drv.last_seq, 0);
 522         ring->fence_drv.initialized = false;
 523
 524         timer_setup(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, 0);
 525
 526         ring->fence_drv.num_fences_mask = ring->num_hw_submission * 2 - 1;
 527         spin_lock_init(&ring->fence_drv.lock);
 528         ring->fence_drv.fences = kcalloc(ring->num_hw_submission * 2, sizeof(void *),
 529                                          GFP_KERNEL);
 530
 531         if (!ring->fence_drv.fences)
 532                 return -ENOMEM;
 533
 534         return 0;
 535 }
 536
 537 /**
 538  * amdgpu_fence_driver_sw_init - init the fence driver
 539  * for all possible rings.
 540  *
 541  * @adev: amdgpu device pointer
 542  *
 543  * Init the fence driver for all possible rings (all asics).
 544  * Not all asics have all rings, so each asic will only
 545  * start the fence driver on the rings it has using
 546  * amdgpu_fence_driver_start_ring().
 547  * Returns 0 for success.
 548  */
 549 int amdgpu_fence_driver_sw_init(struct amdgpu_device *adev)
 550 {
 551         return 0;
 552 }
 553
 554 /**
 555  * amdgpu_fence_driver_hw_fini - tear down the fence driver
 556  * for all possible rings.
 557  *
 558  * @adev: amdgpu device pointer
 559  *
 560  * Tear down the fence driver for all possible rings (all asics).
 561  */
 562 void amdgpu_fence_driver_hw_fini(struct amdgpu_device *adev)
 563 {
 564         int i, r;
 565
 566         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 567                 struct amdgpu_ring *ring = adev->rings[i];
 568
 569                 if (!ring || !ring->fence_drv.initialized)
 570                         continue;
 571
 572                 /* You can't wait for HW to signal if it's gone */
 573                 if (!drm_dev_is_unplugged(adev_to_drm(adev)))
 574                         r = amdgpu_fence_wait_empty(ring);
 575                 else
 576                         r = -ENODEV;
 577                 /* no need to trigger GPU reset as we are unloading */
 578                 if (r)
 579                         amdgpu_fence_driver_force_completion(ring);
 580
 581                 if (!drm_dev_is_unplugged(adev_to_drm(adev)) &&
 582                     ring->fence_drv.irq_src)
 583                         amdgpu_irq_put(adev, ring->fence_drv.irq_src,
 584                                        ring->fence_drv.irq_type);
 585
 586                 del_timer_sync(&ring->fence_drv.fallback_timer);
 587         }
 588 }
 589
 590 /* Will either stop and flush handlers for amdgpu interrupt or reanble it */
 591 void amdgpu_fence_driver_isr_toggle(struct amdgpu_device *adev, bool stop)
 592 {
 593         int i;
 594
 595         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 596                 struct amdgpu_ring *ring = adev->rings[i];
 597
 598                 if (!ring || !ring->fence_drv.initialized || !ring->fence_drv.irq_src)
 599                         continue;
 600
 601                 if (stop)
 602                         disable_irq(adev->irq.irq);
 603                 else
 604                         enable_irq(adev->irq.irq);
 605         }
 606 }
 607
 608 void amdgpu_fence_driver_sw_fini(struct amdgpu_device *adev)
 609 {
 610         unsigned int i, j;
 611
 612         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 613                 struct amdgpu_ring *ring = adev->rings[i];
 614
 615                 if (!ring || !ring->fence_drv.initialized)
 616                         continue;
 617
 618                 /*
 619                  * Notice we check for sched.ops since there's some
 620                  * override on the meaning of sched.ready by amdgpu.
 621                  * The natural check would be sched.ready, which is
 622                  * set as drm_sched_init() finishes...
 623                  */
 624                 if (ring->sched.ops)
 625                         drm_sched_fini(&ring->sched);
 626
 627                 for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
 628                         dma_fence_put(ring->fence_drv.fences[j]);
 629                 kfree(ring->fence_drv.fences);
 630                 ring->fence_drv.fences = NULL;
 631                 ring->fence_drv.initialized = false;
 632         }
 633 }
 634
 635 /**
 636  * amdgpu_fence_driver_hw_init - enable the fence driver
 637  * for all possible rings.
 638  *
 639  * @adev: amdgpu device pointer
 640  *
 641  * Enable the fence driver for all possible rings (all asics).
 642  * Not all asics have all rings, so each asic will only
 643  * start the fence driver on the rings it has using
 644  * amdgpu_fence_driver_start_ring().
 645  * Returns 0 for success.
 646  */
 647 void amdgpu_fence_driver_hw_init(struct amdgpu_device *adev)
 648 {
 649         int i;
 650
 651         for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
 652                 struct amdgpu_ring *ring = adev->rings[i];
 653
 654                 if (!ring || !ring->fence_drv.initialized)
 655                         continue;
 656
 657                 /* enable the interrupt */
 658                 if (ring->fence_drv.irq_src)
 659                         amdgpu_irq_get(adev, ring->fence_drv.irq_src,
 660                                        ring->fence_drv.irq_type);
 661         }
 662 }
 663
 664 /**
 665  * amdgpu_fence_driver_clear_job_fences - clear job embedded fences of ring
 666  *
 667  * @ring: fence of the ring to be cleared
 668  *
 669  */
 670 void amdgpu_fence_driver_clear_job_fences(struct amdgpu_ring *ring)
 671 {
 672         int i;
 673         struct dma_fence *old, **ptr;
 674
 675         for (i = 0; i <= ring->fence_drv.num_fences_mask; i++) {
 676                 ptr = &ring->fence_drv.fences[i];
 677                 old = rcu_dereference_protected(*ptr, 1);
 678                 if (old && old->ops == &amdgpu_job_fence_ops) {
 679                         struct amdgpu_job *job;
 680
 681                         /* For non-scheduler bad job, i.e. failed ib test, we need to signal
 682                          * it right here or we won't be able to track them in fence_drv
 683                          * and they will remain unsignaled during sa_bo free.
 684                          */
 685                         job = container_of(old, struct amdgpu_job, hw_fence);
 686                         if (!job->base.s_fence && !dma_fence_is_signaled(old))
 687                                 dma_fence_signal(old);
 688                         RCU_INIT_POINTER(*ptr, NULL);
 689                         dma_fence_put(old);
 690                 }
 691         }
 692 }
 693
 694 /**
 695  * amdgpu_fence_driver_force_completion - force signal latest fence of ring
 696  *
 697  * @ring: fence of the ring to signal
 698  *
 699  */
 700 void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring)
 701 {
 702         amdgpu_fence_write(ring, ring->fence_drv.sync_seq);
 703         amdgpu_fence_process(ring);
 704 }
 705
 706 /*
 707  * Common fence implementation
 708  */
 709
 710 static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
 711 {
 712         return "amdgpu";
 713 }
 714
 715 static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
 716 {
 717         return (const char *)to_amdgpu_fence(f)->ring->name;
 718 }
 719
 720 static const char *amdgpu_job_fence_get_timeline_name(struct dma_fence *f)
 721 {
 722         struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 723
 724         return (const char *)to_amdgpu_ring(job->base.sched)->name;
 725 }
 726
 727 /**
 728  * amdgpu_fence_enable_signaling - enable signalling on fence
 729  * @f: fence
 730  *
 731  * This function is called with fence_queue lock held, and adds a callback
 732  * to fence_queue that checks if this fence is signaled, and if so it
 733  * signals the fence and removes itself.
 734  */
 735 static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
 736 {
 737         if (!timer_pending(&to_amdgpu_fence(f)->ring->fence_drv.fallback_timer))
 738                 amdgpu_fence_schedule_fallback(to_amdgpu_fence(f)->ring);
 739
 740         return true;
 741 }
 742
 743 /**
 744  * amdgpu_job_fence_enable_signaling - enable signalling on job fence
 745  * @f: fence
 746  *
 747  * This is the simliar function with amdgpu_fence_enable_signaling above, it
 748  * only handles the job embedded fence.
 749  */
 750 static bool amdgpu_job_fence_enable_signaling(struct dma_fence *f)
 751 {
 752         struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
 753
 754         if (!timer_pending(&to_amdgpu_ring(job->base.sched)->fence_drv.fallback_timer))
 755                 amdgpu_fence_schedule_fallback(to_amdgpu_ring(job->base.sched));
 756
 757         return true;
 758 }
 759
 760 /**
 761  * amdgpu_fence_free - free up the fence memory
 762  *
 763  * @rcu: RCU callback head
 764  *
 765  * Free up the fence memory after the RCU grace period.
 766  */
 767 static void amdgpu_fence_free(struct rcu_head *rcu)
 768 {
 769         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 770
 771         /* free fence_slab if it's separated fence*/
 772         kmem_cache_free(amdgpu_fence_slab, to_amdgpu_fence(f));
 773 }
 774
 775 /**
 776  * amdgpu_job_fence_free - free up the job with embedded fence
 777  *
 778  * @rcu: RCU callback head
 779  *
 780  * Free up the job with embedded fence after the RCU grace period.
 781  */
 782 static void amdgpu_job_fence_free(struct rcu_head *rcu)
 783 {
 784         struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
 785
 786         /* free job if fence has a parent job */
 787         kfree(container_of(f, struct amdgpu_job, hw_fence));
 788 }
 789
 790 /**
 791  * amdgpu_fence_release - callback that fence can be freed
 792  *
 793  * @f: fence
 794  *
 795  * This function is called when the reference count becomes zero.
 796  * It just RCU schedules freeing up the fence.
 797  */
 798 static void amdgpu_fence_release(struct dma_fence *f)
 799 {
 800         call_rcu(&f->rcu, amdgpu_fence_free);
 801 }
 802
 803 /**
 804  * amdgpu_job_fence_release - callback that job embedded fence can be freed
 805  *
 806  * @f: fence
 807  *
 808  * This is the simliar function with amdgpu_fence_release above, it
 809  * only handles the job embedded fence.
 810  */
 811 static void amdgpu_job_fence_release(struct dma_fence *f)
 812 {
 813         call_rcu(&f->rcu, amdgpu_job_fence_free);
 814 }
 815
 816 static const struct dma_fence_ops amdgpu_fence_ops = {
 817         .get_driver_name = amdgpu_fence_get_driver_name,
 818         .get_timeline_name = amdgpu_fence_get_timeline_name,
 819         .enable_signaling = amdgpu_fence_enable_signaling,
 820         .release = amdgpu_fence_release,
 821 };
 822
 823 static const struct dma_fence_ops amdgpu_job_fence_ops = {
 824         .get_driver_name = amdgpu_fence_get_driver_name,
 825         .get_timeline_name = amdgpu_job_fence_get_timeline_name,
 826         .enable_signaling = amdgpu_job_fence_enable_signaling,
 827         .release = amdgpu_job_fence_release,
 828 };
 829
 830 /*
 831  * Fence debugfs
 832  */
 833 #if defined(CONFIG_DEBUG_FS)
 834 static int amdgpu_debugfs_fence_info_show(struct seq_file *m, void *unused)
 835 {
 836         struct amdgpu_device *adev = m->private;
 837         int i;
 838
 839         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 840                 struct amdgpu_ring *ring = adev->rings[i];
 841
 842                 if (!ring || !ring->fence_drv.initialized)
 843                         continue;
 844
 845                 amdgpu_fence_process(ring);
 846
 847                 seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
 848                 seq_printf(m, "Last signaled fence          0x%08x\n",
 849                            atomic_read(&ring->fence_drv.last_seq));
 850                 seq_printf(m, "Last emitted                 0x%08x\n",
 851                            ring->fence_drv.sync_seq);
 852
 853                 if (ring->funcs->type == AMDGPU_RING_TYPE_GFX ||
 854                     ring->funcs->type == AMDGPU_RING_TYPE_SDMA) {
 855                         seq_printf(m, "Last signaled trailing fence 0x%08x\n",
 856                                    le32_to_cpu(*ring->trail_fence_cpu_addr));
 857                         seq_printf(m, "Last emitted                 0x%08x\n",
 858                                    ring->trail_seq);
 859                 }
 860
 861                 if (ring->funcs->type != AMDGPU_RING_TYPE_GFX)
 862                         continue;
 863
 864                 /* set in CP_VMID_PREEMPT and preemption occurred */
 865                 seq_printf(m, "Last preempted               0x%08x\n",
 866                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 2)));
 867                 /* set in CP_VMID_RESET and reset occurred */
 868                 seq_printf(m, "Last reset                   0x%08x\n",
 869                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 4)));
 870                 /* Both preemption and reset occurred */
 871                 seq_printf(m, "Last both                    0x%08x\n",
 872                            le32_to_cpu(*(ring->fence_drv.cpu_addr + 6)));
 873         }
 874         return 0;
 875 }
 876
 877 /*
 878  * amdgpu_debugfs_gpu_recover - manually trigger a gpu reset & recover
 879  *
 880  * Manually trigger a gpu reset at the next fence wait.
 881  */
 882 static int gpu_recover_get(void *data, u64 *val)
 883 {
 884         struct amdgpu_device *adev = (struct amdgpu_device *)data;
 885         struct drm_device *dev = adev_to_drm(adev);
 886         int r;
 887
 888         r = pm_runtime_get_sync(dev->dev);
 889         if (r < 0) {
 890                 pm_runtime_put_autosuspend(dev->dev);
 891                 return 0;
 892         }
 893
 894         if (amdgpu_reset_domain_schedule(adev->reset_domain, &adev->reset_work))
 895                 flush_work(&adev->reset_work);
 896
 897         *val = atomic_read(&adev->reset_domain->reset_res);
 898
 899         pm_runtime_mark_last_busy(dev->dev);
 900         pm_runtime_put_autosuspend(dev->dev);
 901
 902         return 0;
 903 }
 904
 905 DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_fence_info);
 906 DEFINE_DEBUGFS_ATTRIBUTE(amdgpu_debugfs_gpu_recover_fops, gpu_recover_get, NULL,
 907                          "%lld\n");
 908
 909 static void amdgpu_debugfs_reset_work(struct work_struct *work)
 910 {
 911         struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
 912                                                   reset_work);
 913
 914         struct amdgpu_reset_context reset_context;
 915
 916         memset(&reset_context, 0, sizeof(reset_context));
 917
 918         reset_context.method = AMD_RESET_METHOD_NONE;
 919         reset_context.reset_req_dev = adev;
 920         set_bit(AMDGPU_NEED_FULL_RESET, &reset_context.flags);
 921
 922         amdgpu_device_gpu_recover(adev, NULL, &reset_context);
 923 }
 924
 925 #endif
 926
 927 void amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
 928 {
 929 #if defined(CONFIG_DEBUG_FS)
 930         struct drm_minor *minor = adev_to_drm(adev)->primary;
 931         struct dentry *root = minor->debugfs_root;
 932
 933         debugfs_create_file("amdgpu_fence_info", 0444, root, adev,
 934                             &amdgpu_debugfs_fence_info_fops);
 935
 936         if (!amdgpu_sriov_vf(adev)) {
 937
 938                 INIT_WORK(&adev->reset_work, amdgpu_debugfs_reset_work);
 939                 debugfs_create_file("amdgpu_gpu_recover", 0444, root, adev,
 940                                     &amdgpu_debugfs_gpu_recover_fops);
 941         }
 942 #endif
 943 }
 944